bagpipes331 Posted September 16, 2014 Share Posted September 16, 2014 Hi, I'm building a Peter Clark 7mm Hampshire unit, and have taken 100s of photos and dimensions of the 2 car unit based at the Mid Hants railway. I have noticed the cab vents on the Driving coach differ to those I have seen on other units. Also there is an additional vent on the trailer cab roof. Also, the electrical coduit runs have been removed. (see attached pic) I have asked at the railway for info as to when these mods took place, but have drawn a blank. Also, I have trawled the net, and there just don't seem to be any good quality shots of the roof of these units. Before I go much further, please can anyone tell me when these mods took place? I'm modelling around 1968-70. Many thanks in anticipation of help, Richard. Link to post Share on other sites More sharing options...
tomstaf Posted September 16, 2014 Share Posted September 16, 2014 Hi Richard, I can't seem the properly from that photo. Are the two type you're referring to the ones closest and furthest from the came my pic below? Cheers Tom Link to post Share on other sites More sharing options...
bagpipes331 Posted September 16, 2014 Author Share Posted September 16, 2014 Hi Tom, I was referring to the removal of the shell type vents above the cab, and the modifications to that area. (The large vent behind the horn on the left) and the round object replacing the r/h shell vent. Thanks Link to post Share on other sites More sharing options...
Flood Posted September 16, 2014 Share Posted September 16, 2014 The Thumper at the Mid Hants is 1125 so would have been built without roof conduit and with scallop instead of shell vents (just like the trailer cars were). 1101 - 1118 were built in 1957 as 2 car units and had the original shell vents and roof lighting conduit. 1119 - 1122 were built in 1958 also as 2 car units and had scallop shell vents and only the basic roof details as per 1125 (originally built for Hastings area). 1123 - 1126 were built in 1959 as 3 car units and also had scallop shell vents and only the basic roof details as per 1125. 1127 - 1133 were the Berkshire units built in 1962 with scallop vents, basic roof details, one less passenger seating bay (more luggage space with large window) and smaller middle windows in the front end. In May 1974 1108 and 1121 swapped identities to keep AWS fitted units at Eastleigh so the new 1108 had new style roofs and the new 1121 had the old style roofs. Link to post Share on other sites More sharing options...
tomstaf Posted September 16, 2014 Share Posted September 16, 2014 Hi Tom, I was referring to the removal of the shell type vents above the cab, and the modifications to that area. (The large vent behind the horn on the left) and the round object replacing the r/h shell vent. Thanks Ahh, The squareish one have been on for years, certainly in the B/G era. They're also on the VEPs, CIGs, etc. The round object is not a vent, forgotten exactly what it is but it's something to do with radio equipment. They're on 455s, 319, and 456s too. Cheers Tom Link to post Share on other sites More sharing options...
bagpipes331 Posted September 16, 2014 Author Share Posted September 16, 2014 Thanks for the info guys! I thought the vents were shell type? ( but no expert!) Here is a pic of one on the trailer roof......... Link to post Share on other sites More sharing options...
Flood Posted September 16, 2014 Share Posted September 16, 2014 Those are definitely shell vents so I stand corrected (the two types on Tomstaf's post are ridge (nearest) and scallop (furthest). Shell vents were prone to corrosion (and the loco hauled coaching stock new builds reverted to ridge vents from late 1958 when supplies of the shell type were exhausted) so I doubt if shell vents were ever used as replacements. Looking at a lot more photos of roofs I've now altered my previous post for the 1958 and 1959 builds. I also thought the small square box is a radio antenna for cab to shore radio but this site: http://www.preservedthumpers.com/tours-chichester-to-midhurst-100.html shows one on 1126 in 1981 (cab to shore was first fitted to locos in 1987) so it probably isn't (unless units had them a lot earlier). That site also shows that 1126 had gained a host of scallop vents by 1981 to replace the corroded shell ones! Link to post Share on other sites More sharing options...
bagpipes331 Posted September 17, 2014 Author Share Posted September 17, 2014 Thanks Flood. One of the things I enjoy with kit building is discovering all the many differences amongst the same class of loco (or DEMU!!) I think the problem comes when using a preserved example as a reference point, as often repairs and alterations have been carried out during preservation which can deviate from when the loco was in service. That said, many had alterations carried out during their working life, and it is often difficult to narrow down to a specific time frame how a particular loco was running. Many thanks again, Richard Link to post Share on other sites More sharing options...
tomstaf Posted September 17, 2014 Share Posted September 17, 2014 Those are definitely shell vents so I stand corrected (the two types on Tomstaf's post are ridge (nearest) and scallop (furthest). Shell vents were prone to corrosion (and the loco hauled coaching stock new builds reverted to ridge vents from late 1958 when supplies of the shell type were exhausted) so I doubt if shell vents were ever used as replacements. Looking at a lot more photos of roofs I've now altered my previous post for the 1958 and 1959 builds. I also thought the small square box is a radio antenna for cab to shore radio but this site: http://www.preservedthumpers.com/tours-chichester-to-midhurst-100.html shows one on 1126 in 1981 (cab to shore was first fitted to locos in 1987) so it probably isn't (unless units had them a lot earlier). That site also shows that 1126 had gained a host of scallop vents by 1981 to replace the corroded shell ones! Hi Flood, The square box is definitely a vent. It's a sort of 'air scoop' for the cabs and has a grill on the front, you can just about see it on some pics. You've now reminded me about what the round part though. As you say, it's the cover for the cab - to - shore radio ariel. I've had a look at some of my pics (late 1990s/early 2000s), and there is a mix of vents on them. I'm sure there was an initial overall plan for the vents, and then some were replaced on an ad hoc basis. Cheers Tom Link to post Share on other sites More sharing options...
Ceptic Posted September 19, 2014 Share Posted September 19, 2014 Ahh, The squareish one have been on for years, certainly in the B/G era. They're also on the VEPs, CIGs, etc. The round object is not a vent, forgotten exactly what it is but it's something to do with radio equipment. They're on 455s, 319, and 456s too. Cheers Tom Agreed, Seen here on a 3-CIG (Lymington Flyer) Link to post Share on other sites More sharing options...
bagpipes331 Posted September 20, 2014 Author Share Posted September 20, 2014 Thanks Ceptic. Now all I need to know is when the shell vents were replaced by the square one!! Link to post Share on other sites More sharing options...
Flood Posted September 20, 2014 Share Posted September 20, 2014 Looking on flickr it appears that 1123 onwards may have had the square vent from new and the older units never got them. Photos of the 1300s in 1964 certainly show them. 1124 certainly has one on the DMBS at Bristol in 1976 and photos of the earlier units in Network SouthEast don't appear to have them. Photos of 1123 are inconclusive. As usual I think it's the "find an actual photo" routine but I appreciate that photos from 1968-70 are rare. Put it this way if a unit hasn't got a square vent in any photo then I doubt it was ever built with one. Link to post Share on other sites More sharing options...
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