Abstract: A support or a railroad crossing gate and warning structure (such as warning lights mounted on a cantilever) has first and second ladders. The first ladder is stationarily mounted on the support so that its bottom rung is spaced from the ground, and the second ladder is mounted adjacent its top end for movement along the stationary ladder between a position where it is above the ground, to a position in which its bottom end is on the ground. The second ladder is also pivotally mounted at its top end to slides which engage the first ladder. Retaining plates are provided for releasably retaining the bottom end of the second ladder in a position in which it is mounted on or at least horizontally adjacent the first ladder, and the plates may be effectively locked together with a padlock to prevent unauthorized use.