can't rely on the resync code in block_reserved since we may need to
clear the stop marker to continue allocation. */
TrackIter track = train.get_block_allocator().first().track_iter();
can't rely on the resync code in block_reserved since we may need to
clear the stop marker to continue allocation. */
TrackIter track = train.get_block_allocator().first().track_iter();