There was a time when passenger trains did cross the High Level Bridge until 1989
There certainly was. Unfortunately, a lot has changed since then.
From the article:
"The High Level Bridge’s main trusses had already lost an average 44 per cent of their width by the time the City of Edmonton took ownership of the bridge in 1994, Stantec engineers say.
City maintenance efforts and repainting has helped slow the loss. The damage only increased five per cent in the last 25 years, they estimated. On the upper level, the railway stringers and floor beams were at 58 per cent and 50 per cent, respectively.
Much of the damaged can’t be seen. The beams are joined by steel plates and rivets. Pack rust builds up inside that connection. That causes plates to bend and rivets to be overloaded, threatening to break the connection, wrote the engineers: 'We cannot recommend a significant increase in loading on the bridge.'"
Could it be brought back to its former capacity? In theory yes, but it would be expensive and complicated.
"...the cost to restore it to original strength would be monumental, said Jason Meliefste, city branch manager for infrastructure planning and design.
'You’re dealing with a 100-year-old structure,' he said in an interview Wednesday. 'It has 5,000 steel beams, more than 1,000 different sizes, all held together with steel plates and old rivets."