This is not a NEPA document. The Federal Register notice is a request for public comment on Canadian Pacific Railway's request for amendment (RFA) to its FRA-certified Positive Train Control (PTC) system, specifically seeking FRA approval for a temporary outage of up to three hours to increase PTC system capacity and perform a Back Office Server update. The Federal Railroad Administration is soliciting comments under 49 CFR 236.1021. No environmental analysis, alternatives, or impact assessments are present.12