CD Baseplate Per GOST | Railway Fasteners

A CD baseplate (often transcribed from the Cyrillic СД, or SD) is a specific type of railway baseplate governed by GOST 8194-75 (now often replaced by newer technical conditions like TU U 30.2-31932840-002:2021).

Unlike the KD model, which is used for separate fastenings where the rail is clamped to the plate, the CD (SD) type is designed for mixed fastening systems on wooden sleepers. In this setup, the same spikes often pass through the baseplate to secure both the plate and the rail foot simultaneously to the sleeper. 

Technical Specifications

• Standard Compliance: Historically GOST 8194-75; modern versions comply with GOST 16277-2016 standards for general quality.

• Material: Manufactured from hot-rolled structural carbon steel, typically grades St4 or St5.

• Design Focus: Features a profile precisely matching the rail foot of R-65 or R-50 rails, typically with four or five holes for spikes or screws. 

Common Models & Dimensions

Model Rail Type Length Width Weight (Approx.)

CD-65 (SD-65) R-65 / P65 330 mm 170 mm 7.1 kg

CD-50 (SD-50) R-50 / P50 310 mm 170 mm 6.2 kg

Key Differences from KD Baseplates

• Fastening Type: KD uses separate fastening (bolts/clamps for rail, spikes for plate); CD uses mixed fastening (spikes often hold both).

• Application: CD plates are commonly found on sidings, industrial tracks, or older mainline sections where mixed spike fastening is still standard.

• Load Distribution: Designed for axle loads up to 250 kN, with an emphasis on preventing lateral rail displacement via its specialized shoulder profile.