There’s an old joke about how they figure out a weight limit for a bridge: they drive bigger and bigger stuff over it until it collapses, then they rebuild the bridge and put up the sign.
Perhaps that’s what happened to this bridge:
From the second in an excellent photo series on World War I from The Atlantic:
On the site where a steel bridge was destroyed, a wooden temporary bridge has been built in place. Note that an English tank which fell in the river when the former bridge was demolished now serves as part of the foundation for the new bridge over the Scheldt at Masnieres.