P143 CEEFAX 143 Fri 15 Apr 21:14/21   -n2n1  -/.%/.%/,  COMMONS   RBILTRBCK HEAD'S SALARY DETAILED   Railtrack'u chairman Robert Horton   will bj paid £121,800 a year for   his contracted three days' work a   week, the Govjrnmjnt has said.     In a Commons written reply,   transport minister Roger Freeman   said Mr Horton's appointment runs   until April 1997.     The salary is at 1993-94 rates, and   is due to bj reviewed.     The Govjrnmjnt-owned company, which   has responsibility for track,   signalling and stations, took over  (5 from BR earlier this month.  --,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,. Next News Main News Dispatch Top Spout