16-16 Basic Statistics on National Railways in Operation
Item	1985	1990	1995	2000	2005	2008	2009
Length of Railways in Operation                (km)	52119	53378	54616	58656	62200	63975	65491
In Formal Operation	49433	50310	50866	51262	57589	60139	63789
In Temporary Operation	2686	3068	3750	7394	4611	3836	1702
Proportion of the Length in Formal Operation	94.8	94.3	93.1	87.4	92.6	94.0	97.4
Double-Tracking Length                             (km)	9989	13024	16909	21408	24497	26599	28682
As Percentage of the Length of Railways	19.2	24.4	31.0	36.5	39.4	41.6	43.8
in Operation
Length of Electrified Railways                   (km)	4151	6941	9703	14864	19408	25007	30243
As Percentage of Railways in Operation	8.0	13.0	17.8	25.3	31.2	39.1	46.2
Length of Diesel Engine Routes                 (km)	10822	16097	24749	39497	42792	38968	35249
As Percentage of Railways in Operation	20.8	30.2	45.3	67.3	68.8	60.9	53.8
Length under Centralized Traffic Control (km)	1307	1169	1226	1200	1828	5541	11588
Automatic Blocking Length                         (km)	6921	10370	12910	18318	24149	28100	31619
Semi-automatic Blocking Length               (km)	42625	38832	40859	41695	39390	37337	38615
Length of Continuous Welded Rail            (km)	10439	14644	21854	29975	47965	62159	68167
Relay Interlocking Station                          (unit)						3849	3449
As Percentage of Stations in Operation						63.8	56.7
Computer Interlocking Station                  (unit)						1888	2356
As Percentage of Stations in Operation						31.3	38.7