What does this traffic sign combination indicate?

You answered correctly. This combination of signs warns about a level crossing with rail traffic and imposes a maximum speed limit of 10 km/h when approaching and crossing it. The correct understanding is that you must slow down to no more than 10 km/h as you approach and drive over the crossing, ensuring safety. It does not indicate any speed restriction for trains; the rule applies to road vehicles only. Remember, always follow such speed limits at crossings for your safety and the safety of others.