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Production of LiAZ-677 started in 1967, it is constructed as a typical bus of 1955-1965 years. But its very reliable construction was very good: even in awful freeze there is warm, the engine worked on petrol, and in winter it didn't turn into ice. Even on the awful road the bus don't jump at the huge sloughs. The serial production of LiAZ-677 finished in august 1994 in Likino, but continued on several factories - in Yakhroma, Bor, Tosno, Petrozavodsk, Orekhovo-Zuevo. Finally their production stopped in 2004, but several towns repair them with the body exchange and get a factically new 677's even now (for example, there is a LiAZ, repaired with the body exchange in 2008 - and only axles are taken from the previous vehicle - http://www.phototrans.eu/14,356583,0,_________677________367_69.html )
The history of this bus seems similiar to Polish Autosan H9-21. Autosan had leaf springs and was a rear-engine, low complicated coach carrying 39 passengers. It was first designed in 1967, then - completely changed, and went into production in 1974. Since then, it had been manufactured in large quantities until about 2001, when it was replaced by... renewed H9 - A0909, which is still produced, although it has few similiarities with original H9 - engine, length and suspension were changed. Autosan H9 was, and even is, cheap to buy and cheap to maintain.
Up to the end of the USSR existance every LiAZ-677 had the Raba rear axle, but in 90s there were problems with them. That's why in 1992 there was a party of buses with the axles from the truck. You can see on the photo the standart type with the smooth descent to the rear platform, where the floor level is lower; At the vehicles with "alternative" axle there was a step to there. Idea wasn't justified, and then they used to install the axles from the scrapped buses, buying them in Moscow and the busparks of nearests cities, up to the end of serial pn.duction.