Basic Statistics on National Railways in Operation
Item	1990	1995	2000	2001	2002	2003
Length of Railways in Operation (km)	53378	54616	58656	59079	71900	73000
In Formal Operation	50310	50866	51262	54013	54422
In Temporary Operation	3068	3750	7394	5066	5108
Proportion of the Length in Formal Operation (%)	94.3	93.1	87.4	91.4	91.4
Double-Tracking Length (km)	13024	16909	21408	22640	23058
As Percentage of the Length of Railways in Operation(%)	24.4	31.0	36.5	38.3	38.7
Length of Electrified Railways (km)	6941	9703	14864	16877	17409
As Percentage of Railways in Operation (%)	13.0	17.8	25.3	28.6	29.2
Length of Diesel Engine Routes (km)	16097	24749	39497	40466	42121
As Percentage of Railways in Operation (%)	30.2	45.3	67.3	68.5	70.8
Length Under Centralized Traffic Control (km)	1169	1226	1200	1163	1401
As Percentage of Railways in Operation (%)	2.2	2.2	2.0	2.0	2.4
Automatic Blocking Length (km)	10370	12910	18318	18845	20682
As Percentage of Railways in Operation (%)	19.4	23.6	31.2	31.9	34.7
Semi-automatic Blocking Length (km)	38832	40859	41695	41336	39990
As Percentage of Railways in Operation (%)	72.7	74.8	71.1	70.0	67.2
Length of Continuous Welded Rails (km)	14644	21854	29975	32502	35967
As Percentage of Trunk Lines (%)	21.7	40.0	51.1	39.0	42.7
Number of Stations With Electric Interlocking (unit)	3535	4587	5232	5288	5278
As Percentage of Railways Stations in Operation (%)	62.9	73.9	90.4	91.6	91.8