“Ilm-fan muammolari yosh tadqiqotchilar talqinida” mavzusidagi 9-sonli respublika ilmiy konferensiyasi 23
must indicate the rail grade: heat-strengthened (letter U) or non heat-strengthened
(letter C); missed tonnage and letter P - repair (Fig. 1, d)
Fig. 1. Samples of marking of old-age rails:
a - rail of the II-I suitability group, heat-strengthened, passed tonnage 240 mln t
gross, removed from the track section with load intensity 65 mln t-km gross/km/year
from a straight line or a curve with a radius of more than 1000 m, suitable for laying;
b - rails of suitability group II, not reinforced, with a pass tonnage of 450 mln
tonnes gross, removed from removed from the track section with an annual tonnage
of 25 mln t-km gross/km, suitable for laying without repair; c - rails of the II quality
group, heat-strengthened, thermal-strengthened, with a gross tonnage of 320 mln t per
year, removed from the track section with the loaded with freight intensity of 60 mln
t-km gross/km/year from a curve with a radius of 1000 m. d - Class II rail, heat-
strengthened, broken down by tonnage 650 mln tons of gross weight, to be repaired at
the FSR; e - defect outside the joint; f - defect along the whole length of the rail;
f - defect on the whole length of the rail; g - defect on the left end of the rail;
h - defect on the right end of the rail; i - a defect on the whole length of the rail;
j - defect on the left end of the rail; h - defect on the right end of the rail;
Literature: 1.
Крейнис З.Л., Селезнева Н.И. Технические обслуживание и ремонт
железнодорожного пути. Учебник. М.: ФГБОУ «Учебно-методический центр
по образованию на железнодорожном транспорте», 2012. - 568с. ISBN 978-5-
89035-681-9
2. Крейнис З.Л., Коршикова Н.П. Техническое обслуживание и ремонт
железнодорожного
пути:
Учебник
для
техникумов
и
колледжей
железнодорожного транспорта. М.: УМК МПС России, 2001. — 768 с. ISBN 5-
89035-050-1
