Gauntlet track, also called interlaced track or gantlet track (AE) is an arrangement in which railway tracks run parallel on a single track bed and are interlaced (i.e., overlapped) in such a way that only one pair of rails can be used at any time. Since this requires only slightly more width than a single track, all rails can be carried on the same crossties/sleepers. Trains run on the pair of rails appropriate to their direction, track gauge or loading gauge.

The term gauntlet refers to the expression running the gauntlet, which means running between two confining rows of adversaries.

Gauntlet tracks can be used to provide horizontal clearance to a fixed obstruction adjacent to a track such as a cutting, bridge, or tunnel. Frog gauntlets are also commonly used when a rail line's capacity is increased by the provision of an additional track, but cost or other factors prevent the widening of the bridges. They are typically used for short stretches of track where it is cheaper to provide extra rails than to provide switches and reduce the line to single track. This also eliminates the problem of switch/point failures.

In a frog gauntlet, one rail crosses over a rail on the adjacent track. A frog is used to provide the flangeway for the crossing tracks. The train taking the gauntlet runs over the frog onto the parallel rails, passes through the gauntlet area, and passes over another frog to return to the original line. Since there are no points or other moving parts on a frog gauntlet track, a train operating on one of the tracks cannot be routed onto the other. Because two trains cannot use the gauntlet at the same time, scheduling and signalling must allow for this restriction. A type of frog gauntlet is common in funicular railways, with gauntlet track along the entire route except for a short doubled section halfway up. Frogs eliminate the need for moving points (which require regular maintenance and can break down) and because both trains are connected by a fixed length of cable there is no risk of a collision occurring as long as a passing loop is provided at the halfway point.

In a point gauntlet track, the rails for the two tracks do not need to cross, so no frog is required. The train taking the gauntlet runs over a set of switch points onto the parallel rails, passes through the gauntlet area, and passes over another set of switch points to return to the original line. This arrangement is used at the Roselle Park station referenced below.

Gauntlet tracks are also often used at weigh scales so that locomotives can bypass the equipment to avoid accidental damage.

At a small number of locations on single track lines in Britain, interlaced loops had been provided where sprung catch points were required because of the steep gradient. The points at either end of the loop were set according to the train's direction of travel. Trains running uphill were routed via the loop incorporating the sprung catch point. Trains running downhill used the opposite loop, bypassing the catch point.

Where routes diverge, but it is not practical to locate the physical switch apparatus at the point of divergence (especially on trams, where roads may be in the way), a section of gauntlet track may be provided between where the routes actually diverge and the location of the physical switch.