Once the Armed Forces of Ukraine (AFU) took its first Russian railway station inside Russia it was in the position to cause chaos and glean valuable troop movement intel.

“Russia has a fully digitised railway system, so once you access the system of any train station, no matter how small, you have access to the entire network,” Paul Con, a Ukraine observer, said in a social media post.

The AFU breakthrough has led to a severe disruption in railway operations, paralysing key routes across the country. The central office of Russian Railways (RZD) has urgently requested the Belarusian railway authorities to halt the dispatching of freight trains to Russia, as the system has become overloaded, according to a report by the Union of Belarusian Railroad Workers.

The main problem is that a reported 133,000 civilians are fleeing the region at the same time after the AFU crossed the border on August 6. And the situation may be getting worse after Ukrainian forces were seen in the Belgorod region to the north, which has now also declared a state of emergency.

The load has incapacitated RZD’s ability to receive trains from Belarus on the Moscow and Bryansk railway routes, which also abuts the Ukrainian border.

Official documents indicate that the request to stop incoming freight trains was issued on August 12, reflecting the critical situation on the ground. The ban is indefinite, as Russian authorities are uncertain when control over the affected railways will be restored, UA Wire reports.

Transport logistics between Russia and Belarus have reportedly collapsed, with numerous freight trains now stranded in dispatch areas. Russia’s Smolensk region in particular has become a bottleneck, with "abandoned" trains accumulating due to the halted traffic. A lack of locomotives has made the situation worse, UA Wire reports.

What remains unclear is if the AFU has been able to hack the RZD’s IT system to further disrupt the railways, however, once into the system they have been able to glean valuable information about Russia’s troop movements. RZD is reportedly now trying to lock the AFU out of the system.

“It seems that the Ukrainians managed to infiltrate the Russian railway system and were able to track the routes of arms shipments. Completely overhauling the system is currently causing significant headaches for IT specialists in Moscow,” added con.

Russia has been struggling to counter the AFU’s incursion. Other reports say that the expeditionary force has brought upgraded drones with them that use new frequencies that are impervious to Russian electronic warfare jamming, while the AFU has also upgraded their own jamming software which is now highly effective against Russian drones. Western reporters that made it to the Russian-Ukrainian border were surprised with the freedom of movement AFU forces have and the total absence of Russian drones. As bne IntelliNews reported, in the drone war, Russia has had the upper hand until recently.

The Kremlin has been bringing reinforcements up from Donbas to counter the AFU’s incursion, and also troops from as far away as Kaliningrad, but to move men and materiel over such long distances in Russia there are few alternatives to the railway.