The Boston & Maine Class P-4 was a series of 4-6-2 "Heavy Pacific" type steam locomotives built by the Lima Locomotive Works for the Boston and Maine Railroad (B&M) to haul passenger trains throughout the New England region.
In 1934, the B&M purchased five new Pacific type engines numbered 3710-14 and were classified as P-4a. These locomotives were originally built with smoke deflectors, a single air compressor mounted on their pilot deck, and a metal sky-lining shroud covering up the top of their boiler thus giving them a semi-streamlined appearance which earned them the title of "Super Power" locomotives. After the purchase of another batch of Pacifics, Nos. 3715-19 classified as P-4b, in 1936, the railroad held a contest to give each engine a name.
Of the 10 built only one, No. 3713, has been preserved and currently resides at the Steamtown National Historic Site in Scranton, Pennsylvania.
Stock list[]
| Image | No. | Name | Status | Notes |
|---|---|---|---|---|
| 3710 | Peter Cooper | |||
| 3711 | Allagash | |||
|
3712 | East Wind | ||
|
3713 | The Constitution | Only surviving B&M pacific. Under restoration at Scranton national steamtown | |
| 3714 | Greylock | |||
| 3715 | Kwasind | |||
| 3716 | Rogers' Rangers | |||
| 3717 | Old North Bridge | |||
| 3718 | Ye Salem Witch | |||
| 3719 | Camel's Hump |

