An Update Re Subway Special Work

There was a conversation recently in comments on this blog about a perceived improvement in the noise (or lack of it) of subway trains on special work (switches and crossovers, also known as “frogs”) at Lawrence and Keele Stations. I postulated a few possible answers, but wrote to the TTC to ask what they had done.

Their response, from Stuart Green, Senior Communications Specialist, confirms what I had expected and provides additional details.

Lawrence Double Cross-Over

  • It is an improved design with different type of heel that eliminates the joint at the heel of the switch.
  • Two turnouts are now flange bearing lift frogs that means continuous rail at the crossing – no jumping over the toe of the frog.
  • Newer rails that have no end battering at the joints
  • New ballast that provides better load transfer and required stiffness/flexibility to track.

Keele Double Cross-Over

  • New double cross-over is of the same design with some improvement in the design to make it smoother. The main reasons for smoother ride are new rails and new frog that do not have any end battering or excessive wear.
  • New ballast that provides better load transfer and required stiffness/flexibility to track.