I believe the Columbia Avenue bridge right now has a weight limit of 13 tons. Many years ago one of the concrete piers under the bridge was damaged due to a derailment.
A bridge similar to the Columbia Avenue bridge is the lost Arsenal Street UPRR bridge. It is located about 1/4 mile south of the Columbia Avenue Bridge. It had a hump in the middle and similar balustrades. It too was built in 1913 and was replaced in 2006.