Near the beginning of the Crosstown LRT project, there were discussions on having the 512 ST. CLAIR being extended to Jane Street and using the proposed Jane LRT and Eglinton LRT tracks to reach the Mt. Dennis EMSF. It was rejected because of the different track gauges between the legacy streetcar network and the transit city network.
Looking elsewhere in the world, they actually are able to use what is called
gauntlet track or
interlaced tracks. They are an arrangement in which
railway tracks run parallel on a single
track bed and are interlaced (i.e., overlapped) such that only one pair of rails may be used at a time. Since this requires only slightly more
width than a
single track, all rails can be carried on the same
crossties/sleepers. Trains run on the discrete pair of rails appropriate to their direction,
track gauge or
loading gauge.
The term
gauntlet refers to the expression
running the gauntlet, which means running between two confining rows of adversaries.
From
link.