When I was in Ballykelly the railway line ran across the end of the runway, the control tower could turn the signals to red. Don't know if it was interlocked! Get it wrong and the undercarriage running over the train roof would be a wake up. Believe the set-up was unique in Northern Hemisphere.
Maybe ... not sure what the setup was for the Henbury Loop running across the taxiways from the big hangars at Filton. I expect our S and T Engineering friends will be able to advise.
I still have the aerodome diagram for the now sadly closed Filton airfield.
In this, the main internal access road between Airbus site and airfield runs across a bridge over the railway line, at around the western end of the old Filton North platforms, just by the helicopter pad on the lower mid-right. The taxiway crossed the railway line at the point marked "F" to the right of one of the windsocks. I last saw that being used by an A380 before they entered service, during fuel trials, unfortunately on a day that I didn't have a camera with me. The line F was a holding point - aircraft could not pass that without the permission of the tower. You could also not start engines or taxy without their say-so. I would guess that the tower would check with the signalman before letting aircraft start up, and that it would be more common for the very occasional aircraft to wait for the then comparatively frequent trains.
I don't recall there being gates on the level crossing, nor any furniture that may have got in the way of a taxying aircraft. The only picture I have of it is a frame-grab from a video taken by my son as I was taking off from Filton for the last time, back in March 2009. The reflection of a hi-vis jacket is a bit annoying, but the crossing is visible.
Academic now, as the airfield site is fenced off from the remaining factory side.
