Epsilon Electronic Equipment & Components Pvt. Ltd. Offers Train Traffic Control Equipment with DTMF Signaling. Epsilon Electronic Equipment & Components Pvt. Ltd. Supplies signal & telecom items for the Indian railways. Train Traffic Control Equipment with DTMF Signaling consist of control room equipment, 4 wire - 2 wire conversion unit, control way side station equipment, control telephones with dual tone multiple frequency [DTMF], signaling for 2 wire and 4 wire operations. Train Traffic Control Equipment with DTMF Signaling is basically for 99 stations expandable to 999 stations. This equipment gives facility for general codes, group codes which are provided.