As of early 2026, the Amtrak Adirondack service to Montreal has been subject to intermittent suspensions and speed restrictions primarily due to track maintenance and heat-related safety issues on the Canadian side of the border. The tracks north of the border are owned by Canadian National Railway (CN), which implements strict speed restrictions (as low as 10 mph) when temperatures exceed 30°C (86°F) to prevent "heat kinks" or track warping. These delays became so severe in 2023 and 2024 that Amtrak frequently chose to truncate the service at Albany or Saratoga Springs rather than subject passengers to a 12-hour journey. Furthermore, there have been ongoing discussions regarding U.S. Customs pre-clearance at Montreal Central Station; currently, the train must stop at the border for a lengthy, manual immigration process that can take up to two hours. While both governments are investing in track upgrades and better border facilities, the combination of old infrastructure and the logistical "middleman" of a private freight railroad owner continues to make the New York-to-Montreal route a seasonal challenge for Amtrak.