Basic Statistics on National Railways in Operation
Item	1978	1985	1990	1995	2000	2001
Length of Railways in Operation (km)	48618	52119	53378	54616	58656	59079
In Formal Operation	45539	49433	50310	50866	51262	54013
In Temporary Operation	3079	2686	3068	3750	7394	5066
Proportion of the Length in Formal Operation	93.7	94.8	94.3	93.1	87.4	91.4
Double-Track Length (km)	7630	9989	13024	16909	21408	22640
Percentage of the Length of Railways in Operation	15.7	19.2	24.4	31.0	36.5	38.3
Length of Electrified Railways (km)	1030	4151	6941	9703	14864	16877
Percentage of Railways in Operation	2.1	8.0	13.0	17.8	25.3	28.6
Length of Diesel Engine Routes (km)	6550	10822	16097	24749	39497	40466
Percentage of Railways in Operation	13.5	20.8	30.2	45.3	67.3	68.5
Length Under Centralized Traffic Control		1307	1169	1226	1200	1163
Percentage of Railways in Operation		2.5	2.2	2.2	2.0	2.0
Automatic Blocking Length (km)	5981	6921	10370	12910	18318	18845
Percentage of Railways in Operation	12.3	13.3	19.4	23.6	31.2	31.9
Semi-automatic Blocking Length (km)	34759	42625	38832	40859	41695	41336
Percentage of Railways in Operation	71.5	81.8	72.7	74.8	71.1	70.0
Length of Continuous Welded Rail (km)	6530	10439	14644	21854	29975	32502
Percentage of the Trunk Lines	12.2	16.7	21.7	40.0	51.1	39.0
Number of Stations With Electric Interlocking (unit)	1336	2320	3535	4587	5232	5288
Percentage of Railways Stations in Operation	27.7	46.9	62.9	73.9	90.4	91.6