This is an express station, with four tracks and two island platforms. It has the same 10" × 5" eggshell-beige wall tile as the next three stations north. The tile band, however, is a delicate shade of lilac with a violet border, similar to the Delancey Street stop in Manhattan. The I-beams are tiled and feature mini-vertical name tablets reading "Euclid," along with the two-tone border motif. Away from the platform center, there is a single row of these I-beams running down the middle of the platform. The south end of both platforms has an elevated crew quarters. The station has a crossover in the mezzanine along with an active newsstand.
East (railroad south) of the station the trackwork is quite complex, first allowing trains to enter the Pitkin Yard from either the express or the local tracks (where C trains relay to get from the southbound to the northbound local track), then the connection to Grant Avenue station, also from either the express or local tracks. All four trackways continue, disused, east under Pitkin Avenue until approximately Elderts Lane.