I have seen a 'plan' for a streetcar tunnel to be punched through the rail berm to east of the current bridge. I think this was part of the Metrolinx documents about adding tracks to the rail line and the widening of all the bridges between Yonge and Parliament. The current 'signal box' on north side of the berm and east of the bridge will (soon) be obsolete and it will be moved a bit further east. When it is not there the new streetcar tunnel COULD go through - but I doubt it will happen for many years.If the current tracks are already off street to the east of Cherry Street, think they'll just drill/dig/construction a streetcar only underpass under the railway. All there is only a parking lots and empty weed fields.