Railroad Valley springfish is one of five subspecies of White River springfish. The body is two-thirds as wide as deep and the head is relatively large. The dorsum is yellow to olive to gray with a dark stripe extending along the surface from snout to tail and the ventral half is silver. They can be distinguished from the other subspecies by a single row of dark spots along their side. This subspecies has an average total length varying between 22.9 and 38.1 mm (0.9 and 1.5 in) but may attain a total length exceeding 71.1 mm (2.8 in).