Page:RP1357.pdf/169



Figure 3-1. Station modules and tugs evolution. The chart above summarizes the evolution of vehicles originally developed as transport craft for the Almaz space station program and subsequently reapplied to many new functions. The narrow light gray arrow coming down from the top leads from the Soyuz Programs chart (figure 1-1). The broad gray arrows trace what is generally known in the West about the evolution of Soviet/Russian space station modules and tugs. The black-lined box encloses the TKS program, and the black arrows (solid and dashed) lead to the Station Programs chart (figure 2-1).