Nostalgia for me as well. When I was a kid, was frequently on all blue 503s going to Liverpool. They looked very dull, miserable but then again, Liverpool Central was very dark before the loop and link was done. What really caught my eye, still a kid of course, was seeing an 03 shunter, well, shunting around Duke Street (I think the 04s had been withdrawn by then), shortly after I saw a 47 and was amazed with this massive thing.
Don't have the 503s unfortunately but have the Bachmann 03s which do look rather good and lots of Vitrains 47s which may look good if the myriad of bits get fitted. What were they thinking with all those seperate parts, worse than an Airfix kit!