It runs 5.5 km ( 3.4 mi ) east , underneath Sheppard Avenue from Sheppard Station on the Yonge line ( now renamed Sheppard-Yonge ) , to Don Mills Station at Sheppard and Don Mills Road .
It runs 5.5 km east , under Sheppard Avenue from Sheppard station on the Yonge line ( now called Sheppard-Yonge ) , to Don Mills station at Sheppard and Don Mills Road .