Railway border crossing Kuźnica Białostocka-Grodno, Railway border checkpoint between Poland and Belarus, connecting Kuźnica Białostocka and Grodno.

The railway station in Kuźnica Białostocka serves as a border checkpoint between Poland and Belarus with customs facilities and control points for both passenger and freight services. The facility includes specialized infrastructure designed to process trains moving in both directions.

In October 1945, a first-category transit control point, Kuźnica Białostocka, was set up as part of the forming Border Protection Troops on the Polish-Soviet border. During the Soviet era a Polish-Soviet railway crossing called Kuźnica operated here for passenger and freight traffic, with clearance handled by the Kuźnica border control post. The crossing now links Poland and Belarus on the Warsaw–Saint Petersburg line, with a standard track and a broad-gauge track.

The crossing lies on the Warsaw–Saint Petersburg railway, so the line itself is a shared Polish-Russian legacy. Two tracks run through it: a standard-gauge track of the Białystok–Grodno line and a broad-gauge one. Border checks are carried out by the Border Guard post in Kuźnica, and since 10 April 2026 the EU Entry/Exit System registers non-EU travellers here.

The crossing operates around the clock and handles people, vehicles and goods regardless of nationality, plus local border traffic. Border checks are carried out by the Border Guard post in Kuźnica. Two tracks run through it: a standard-gauge track of the Białystok–Grodno line (the Warsaw–Saint Petersburg railway) and a broad-gauge track.

The railway site uses different track gauges on the Polish and Belarusian sides, requiring special equipment to change train wheels for cargo transfer. This technical distinction is a key reason why the crossing has specialized infrastructure.