Wagonmaster Posted May 1 Share Posted May 1 I'm trying to build a model of TfW's Class 197 dmu. However, trying to find out some details of these units is proving difficult. I'm hoping that some of you on RMWeb might know, or point me in the right direction. The first problem is wheel diameter. They look quite small to me abd I wondered if anyone knew what the wheel diameter is? The bogie wheelbase appears to be 7ft. 6in. If anyone has built one, what did you use? The second main problem is car numbers. I have found lists of unit numbers, but not individual car numbers. With the units I've seen, they seem to have the car numbers at the inner ends and a long number underneath, which I'm guessing is the European number system? The numbers also appear to be a dark grey rather thzn black. Is that correct? I think I have the paint shades right with Goosewing Grey for the main body colour and Traffic Red. Any help gratefully appreciated. Link to comment Share on other sites More sharing options...
Hesperus Posted May 2 Share Posted May 2 Sorry I don't know the answer to any of those but did take a slightly iffy picture the other week (while waiting for the level crossing). 1 Link to comment Share on other sites More sharing options...
Bill Radford Posted May 3 Share Posted May 3 197 001 - 131001 133001 upto 197 051 - 131051 133051 plus 197101 - 131101 132101 133101 upto 197126 - 131126 132126 133126 Platform 5 - 2022 Link to comment Share on other sites More sharing options...
Mol_PMB Posted May 3 Share Posted May 3 This link for the very similar 195s may be useful. It contains some outline drawings and gives bogie wheelbase as 2.25m https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=&ved=2ahUKEwj4m6relPGFAxXcZkEAHcKQCKwQFnoECEcQAQ&url=https%3A%2F%2Fcdn.prgloo.com%2Fmedia%2Fdownload%2F10c154dc2f474e71b25d0844cc7b56c5&usg=AOvVaw0bsXkgDa2eFlrkZsC9g0be&opi=89978449 Despite having done a lot of work on the yaw damper bracket issues on these in a previous job, I'm afraid I no longer have access to the technical data and I can't remember the wheel diameter range. Link to comment Share on other sites More sharing options...
Wagonmaster Posted May 3 Author Share Posted May 3 6 hours ago, Bill Radford said: 197 001 - 131001 133001 upto 197 051 - 131051 133051 plus 197101 - 131101 132101 133101 upto 197126 - 131126 132126 133126 Platform 5 - 2022 Thanks for your reply and the info. I should really get the latest Platform 5 edition! Steve Link to comment Share on other sites More sharing options...
Wagonmaster Posted May 3 Author Share Posted May 3 5 hours ago, Mol_PMB said: This link for the very similar 195s may be useful. It contains some outline drawings and gives bogie wheelbase as 2.25m https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=&ved=2ahUKEwj4m6relPGFAxXcZkEAHcKQCKwQFnoECEcQAQ&url=https%3A%2F%2Fcdn.prgloo.com%2Fmedia%2Fdownload%2F10c154dc2f474e71b25d0844cc7b56c5&usg=AOvVaw0bsXkgDa2eFlrkZsC9g0be&opi=89978449 Despite having done a lot of work on the yaw damper bracket issues on these in a previous job, I'm afraid I no longer have access to the technical data and I can't remember the wheel diameter range. Thanks for your reply. As it happens, I did come across that document. 2.25m is about 7ft. 5in., so not too far out! Pity it didn't show wheel diameter, but I'm guessing they might be 870mm? Would that sound about right? Steve Link to comment Share on other sites More sharing options...
Mol_PMB Posted May 3 Share Posted May 3 I'm pretty sure they're smaller than 870mm. Turbostars etc are 840mm new, and I think these are smaller than that. Let me ask Northern maintenance control and see if he knows. Link to comment Share on other sites More sharing options...
Wagonmaster Posted May 3 Author Share Posted May 3 19 minutes ago, Mol_PMB said: I'm pretty sure they're smaller than 870mm. Turbostars etc are 840mm new, and I think these are smaller than that. Let me ask Northern maintenance control and see if he knows. Thank you, that's very kind of you. My second guess would be 760mm, but they're always going too fast for me to measure! Link to comment Share on other sites More sharing options...
br2975 Posted May 4 Share Posted May 4 Just a few recent shots of what some local enthusiasts refer to as 'Marvins' ( and no, I don't know why ). . Good luck with your modelling them. 1 Link to comment Share on other sites More sharing options...
Mol_PMB Posted May 4 Share Posted May 4 Hank Marvin = Starving ? Marvin the Paranoid Android? Link to comment Share on other sites More sharing options...
7802 Posted May 4 Share Posted May 4 I would assume it’s a reference to the paranoid android from the original hitchhikers guide to the galaxy. There is a passing resemblance. Link to comment Share on other sites More sharing options...
RMweb Gold Adam1701D Posted May 4 RMweb Gold Share Posted May 4 As soon as a 197 pulls into your station, you feel very depressed. 1 4 Link to comment Share on other sites More sharing options...
Mol_PMB Posted May 18 Share Posted May 18 On 03/05/2024 at 17:49, Wagonmaster said: Thank you, that's very kind of you. My second guess would be 760mm, but they're always going too fast for me to measure! Sorry this has taken a while. New diameter 780mm, minimum 710mm. Mol Link to comment Share on other sites More sharing options...
Merfyn Jones Posted May 18 Share Posted May 18 5 hours ago, Mol_PMB said: Sorry this has taken a while. New diameter 780mm, minimum 710mm. Mol For OO I have used 10.5 mm dia. wheels on the Tenshodo motor bogie and the non powered bogies. Looks right to me. 1 1 1 Link to comment Share on other sites More sharing options...
Wagonmaster Posted May 18 Author Share Posted May 18 7 hours ago, Mol_PMB said: Sorry this has taken a while. New diameter 780mm, minimum 710mm. Mol Thanks Mol, that's great. I thought they might be 10.5mm, so I'll get on and order some. Seems quite a difference between new and minimum sizes! Thanks to you too Merfyn, I see that's what you have used and it does look about right. They do look very small in comparison to the 14mm wheels on the Class 304 I'm also building! Steve Link to comment Share on other sites More sharing options...
RMweb Gold Enterprisingwestern Posted May 18 RMweb Gold Share Posted May 18 Hope you get this finished before the rtr one comes out! Mike. Link to comment Share on other sites More sharing options...
Mol_PMB Posted May 18 Share Posted May 18 32 minutes ago, Wagonmaster said: Thanks Mol, that's great. I thought they might be 10.5mm, so I'll get on and order some. Seems quite a difference between new and minimum sizes! Thanks to you too Merfyn, I see that's what you have used and it does look about right. They do look very small in comparison to the 14mm wheels on the Class 304 I'm also building! Steve It's quite normal to have 50 to 70mm difference from new to scrapping size. Gives you the opportunity for several cycles of wear and reprofiling before the wheel pans have to be scrapped. Link to comment Share on other sites More sharing options...
Wagonmaster Posted May 19 Author Share Posted May 19 23 hours ago, Enterprisingwestern said: Hope you get this finished before the rtr one comes out! Mike. Is there an rtr one due? Just my luck if there is! Steve Link to comment Share on other sites More sharing options...
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