Railroad history.

no.127-131 1972-1974; no.132-135 1975-1976; no.136-139 1977-1978; no.140-145 1979-1981; no.146-151 1982-1984; no.152-153 1985; no.154-155 1986; no.156-157 1987; no.158-159 1988; no.160-161 1989; no.162-163 1990; no.164-165 1991; no.166-167 1992; no.168-169 1993; no.170-171 1994; no.170-173 1994-1995; no.172-173 1995; no.174-175 1996; no.176-177 1997; no.178-179 1998; no.180-181 1999; no.182-183 2000; no.184-185 2001; no.186-187 2002; no.186-189 2002-2003; no.190-191 2004; Suppl. 2000