34 Pa. Code § 41.174 – Interior lighting.

(a) Except as otherwise provided in subsection (b), there shall be compliace with the following requirements:
1. (1) The interior of new cabin cars shall be equipped with not less than two electric lights with a minimum of 4-foot candlepower (one located over the desk and one centralized).
2. (2) The interior of existing cabin cars shall be equipped with one electric light with a minimum of 4-foot candlepower located over the desk. Thereafter, each railroad subject to this subchapter shall equip a minimum of 20% of its cabin care which are subject to this subchapter each year, so that there may be full compliance before July 1, 1974.
(b) Cabin cars operated exclusively in the daytime; those operated within yard limits and within terminal limits, either in the day or night; and those operated within a radius of 15 miles from point of dispatchment, regardless of whether the operation is wholly within this Commonwealth, are exempt.