Last shot shows the tracks approaching the bridge.
The sign with the two black dots is a "Flanger Warning sign" which tells the operator of a flanger, spreader or a snowplow equipped with a flanger that there is an obstruction between the rails ahead (in this case, the bridge guardrails) and that the flanger blades must be raised to avoid damaging them.
Terry
The sign with the two black dots is a "Flanger Warning sign" which tells the operator of a flanger, spreader or a snowplow equipped with a flanger that there is an obstruction between the rails ahead (in this case, the bridge guardrails) and that the flanger blades must be raised to avoid damaging them.
Terry