Boston Metro is a map made by Gwizz and seems to be an experiencing one related to PNW only. I've just played it (as the translater, of course, the German one ) and started by using the Mallard 4-6-2 only. I reached Bronze in 1941 and thereafter switched to electric - hmmm - run into deep depression and had to wait some years to turn all engines into an E18. I still went on to link to almost any city and "finished" - it's an open end map - by getting Silver in 1948 and Gold in 1949.
All in all, not really a challenging, but in any case a map making great fun to play.
Boston Metro
Boston Metro
There's no business like RT business ...