In 1928, Alco built five D-1a 4-6-6T bi-directional steam locomotives (#400 to #404) for use on the Boston & Albany Railroad in commuter service between downtown Boston and its suburbs. One of the routes on which these engines ran was a circuit – outbound on the main line to Riverside, inbound on the Highland Branch to South Station, and in the opposite direction. Since these engines were double-ended, it was unnecessary to turn them before the next run.
I became interested in the Boston & Albany Railroad when I went to school next to the tracks of the B&A’s Grand Junction Branch – but that was years after the “tank engines” were retired in 1951. So, when K-Line made its model of the tank engine with TMCC (#403) and Lionel followed with a Legacy version (#400) using K-Line’s tooling, I bought examples of each. But I still need passenger cars in the Boston & Albany livery. When Lionel produces a model of a B&A 4-6-6T with another road number, I will buy one.
The tank engines had 63-inch drivers, ran at 215 psi boiler pressure, weighed 352,000 pounds, and developed 41,600 pounds tractive effort. They were the biggest tank engines ever to run in the United States and were designed for rapid acceleration.
After the Boston & Albany ended commuter service around Boston, the Highland Branch was converted to light rail by the Massachusetts Bay Transportation Authority (MBTA) in 1959 and continues in operation today as its Green Line. CSX uses the main line for freight.
Photos and videos show #400 and #403 running on my 12’-by-8’ layout.
MELGAR