Signalling maintenance Oslo S; Drammensbanen and Spikkestadbanen

Condition control; testing; adjustment and correction of deviations in signalling systems of type NSB-94; NSI-63 and NSB-77 on parts of Oslo central station and the complete line Spikkestadbanen and Drammenbanen. The work was done by certified signalling personnel ("Sikkerhetskontrollør signal" and "Sluttkontrollør F").