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Applying AREMA Longitudinal Braking and Tractive Forces to a Tunnel

Applying AREMA Longitudinal Braking and Tractive Forces to a Tunnel

Applying AREMA Longitudinal Braking and Tractive Forces to a Tunnel

(OP)
I'm designing a reinforced, C.I.P., concrete load-out tunnel under a railroad track. The tunnel runs perpendicular to the track. Its top is at grade, and the track runs across it. Support for the track rails is via steel I-beams spanning between the tunnel walls. The rails are bolted to the I-beams and there is no tunnel lid between rails.

My questions are as follows:
(1) Do I need to design the beams and tunnel for the tractive and braking forces specified in 2.2.3 of The AREMA manual?
(2) My tunnel is only 10'-0" wide, applying the full braking and tractive forces of (45+1.2L) and 25(L)^.25, respectively seems unreasonable. Is there any AREMA provisions that allow me to reduce the percentage of these loads resisted directly by the tunnel.
(3) The track is part of a siding at a grain storgage facility. Does the fact that the tracks are not part of a main line and will only have low speed traffic affect the loading required by AREMA?

Thanks, in advance, for any help you can provide

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