Unofficial LEGO Sets/Parts Collectors Guide - Among many LEGO Train collectors, the golden age was 1980-1990... the 12V electric train years. And probably the most popular was the 7740 Intercity Train (not
LEGO 7740 Inter-City Passenger Train Set Instructions, Trains
I finished my cheapskate's interpretation of set 7740 today! : r/lego
LEGO 7740 12v Electric Inter-City Passenger Train Set Set Parts Inventory and Instructions - LEGO Reference Guide