CLASS Z BOGIE
Z CLASS consisted of locomotives with drivers and cylinders in a frame or bogie which swiveled under the boiler. All were built by Mason.
Z-1 CLASS
601 was built by Mason in 1885 as Old Colony 1 (Third 1).
831 later 2100 was built by Mason in 1890 as Old Colony 231.
Providence Warren & Bristol 7, "Pokanocket" was built by Mason in 1885 to negotiate the tight curve in East Providence.
Became Z-1 2102 and was retired in May 1906 around the time the line was electrified.
Fireman's side of PW&B 7, later Z-1 2102.
Z-2 CLASS
753 later 2103 was built by Mason in 1885 as Nantasket Beach RR 6.