IIRC escalators are a "buy American" problem. It doesn't make economic sense to build escalators completely in the US, so anyone with a choice imports the key equipment and this goes very smoothly. There isn't enough market for all-American escalators to sustain true factories. But government projects are legally required to source everything domestically, so parts get made in one-off metal shops. Then, when repairs are needed, everything's nonstandard and replacement parts can't just be ordered.