Work may also be performed in outdoor environments, street environments (near moving traffic), construction sites, in the community (homes, business, etc.), Railroad Track and Right-of-Way environments, warehouse environments, and shop environments, with possible exposure to individuals who are hostile or irate, extreme heat (above 100 degrees), moving mechanical parts, fumes or airborne particles, and loud noises (85+ decibels such as heavy trucks, construction, etc.). Proven track record and experience working successfully in a high-pressure work environment (making appropriate decisions, understanding potential impacts, and taking responsibility); Advanced understanding of operational systems and architectures (including workstations, servers, and networks) at a level appropriate to design, troubleshoot, and maintain such systems as a second-tier responder for PTC.