BRC/WR is unlikely to provide WAP5/WAP7 links for this train. Reasons :- 1. 12833/34 is owned and maintained by SER. 2. SRC ETS isn't equipped to maintain a 3-phase locomotive (neither WAP5 nor WAP7). If, by chance, a 3-phase loco hauls this train as off-link, it'll be sent to HWH (ER) for maintenance :P.
Unfortunate truth. At present, this train is unlikely to get a 3-phase loco link. But yes, since CLW stopped the production of conventional locomotives (WAP4/WAG7 types), 3-phase locos may be provided in future. Hope exists :)