Since your operations leave the confines of your property and cross a public street; I believe your crews should be FRA certified. This is particularly true if they are operating on railroad owned or controlled track.
The following from 49 CFR explains how FRA defines a plant railroad and whether it’s operations fall under FRA jurisdiction. The very last sentence seems to cover what your crews are currently doing.
Plant Railroads
FRA’s regulations exclude from their reach railroads whose entire operations are confined to an industrial installation (i.e., "plant railroads"), such as those in steel mills that do not go beyond the plant’s boundaries. Other regulations (e.g., 49 C.F.R. §214.3, railroad workplace safety) exclude not only plant railroads, but also any railroad that is not operated as a part of, or over the lines of, the general railroad system of transportation. By "general railroad system of transportation," FRA refers to the network of standard gage track over which goods may be transported throughout the Nation and passengers may travel between cities and within metropolitan and suburban areas. 49 C.F.R. Part 209, App. A. Much of this network is interconnected, so that a rail vehicle may travel across the Nation without leaving the system. However, mere physical connection to the system does not bring trackage within the FRA’s jurisdiction. For example, trackage within an industrial installation that is connected to the network only by a switch for the receipt of shipments over the system is not considered to be part of the general railroad system of transportation.
Even where a railroad operates outside the general system, other railroads that are part of that system may have occasion to enter the railroad’s property (e.g., a major railroad goes into a chemical or auto plant to pick up or set out cars.) In such cases, the railroad that is part of the general system remains part of the system while inside the installation; therefore, all of its activities are covered by FRA’s regulations during that period. The plant railroad itself, however, does not get swept into the general system by virtue of the other railroad’s activity, except to the extent it is liable, as the track owner, for the condition of its track over which the other railroad operates during its incursion into the plant. Of course, in the opposite situation, where the plant railroad itself operates on the general system, it becomes a railroad with respect to those particular operations, during which its equipment, crew, and practices would be subject to FRA’s regulations.
Curt