This pedestrian bridge is based on the HO pedestrian bridge from Auhagen.
see their catalog on : http://auhagen.de/csdata/epaper/produkt_katalog/index.html?utm_source=auhagen.de&utm_medium=301&utm_campaign=url

the pedestrian bridge can be found here (page 41):
http://auhagen.de/csdata/epaper/produkt_katalog/index.html?utm_source=auhagen.de&utm_medium=301&utm_campaign=url#/40