Thanks guys, My Baldwin AS-616 is a co-co road switcher, finished in UP colours (but probably will get a repaint in SP "Black Widow" colours eventually as luckily they used them too). It uses a couple of MDC Speeder cheapo chassis to power 4 wheels on each bogie, the frames being built in plasticard as there is no commercial version which comes anywhere near - as such its not the best nor quietest runner though adequate around my small yard, but conversely its a little big for said layout! It was built using a line drawing and lots of photos, and scaled as best as I could guess to match my 1/29 stock. Construction was around a framework of Plastruct tubes, flat areas being the usual overlays of plasticard. I will try to get some pics up shortly.