One of the most obvious features of the L&B was its rail vehicles , with the engines appearing first in a plain lined Holly green color , later on a black base , with chestnut under-frames , pulling passenger carriages colored terra-cotta with cream upper panels , and light gray goods wagons . One of the most distinctive aspects of the L&B was its rolling stock , with the locomotives appearing originally in a livery of plain lined Holly green , later on a black base , with chestnut under-frames , hauling passenger carriages colored terracotta with off-white upper panels , and light gray goods wagons .