Snowdon tail track
Cage at the end of the Snowdon tail tracks
Cage at the end of the Snowdon tail tracks, at the corner of ch. Queen Mary and rue Dufferin
Besides featuring one of the two connections between the blue and orange lines, this is one of the more complicated tail tracks owing to the stacked platforms at Snowdon station. In addition to reversing at the end of the blue line and connecting between the two lines, the tail track is also used for stabling at night.

In the two-level tunnel exiting the terminus westward, the eastbound track first realigns itself to run beside the westbound track above; the two tracks then slope together. Next, the tunnel curves to run underneath ch. Queen Mary, and continues as far as rue Dufferin, a total of approximately 790 metres west of the station bulkhead. The end of the tail tracks is marked by a blue cage structure enclosing an emergency exit.

For its part, the connecting track connects the southern (outbound) track in the Snowdon tail track with the western (southbound) track on the orange line between Snowdon and Villa-Maria stations.