Unofficial LEGO Sets/Parts Collectors Guide - The LEGO 12V Electric Trains of the 1980s were very popular among LEGO train collectors. The 1970s 12V trains (starting in 1969) were only sold in
LEGO 7740 12v Electric Inter-City Passenger Train Set Set Parts Inventory and Instructions - LEGO Reference Guide
LEGO Trains: Inter-City Passenger Train Set (7740) for sale online | eBay
LEGO MOC 7740 Panoramawaggon by Klemmie | Rebrickable - Build with LEGO
LEGO 7740 Inter-City Passenger Train Set Instructions, Trains