Sigma is a leading global company in the development of Transport and Heavy Duty HVAC Systems for the Rail, Mining, Industrial and the demanding Defence markets. The World of Sigma truly covers the Globe across several market groups. The products are produced with over 50 years of broad experience in the air conditioning markets. Sigma provides a "whole of life" outlook for its products and provides tailored system solutions that deliver true value to our customers. Sigma is a Quality Assured company to ISO9001 at all its operations and has extensive Research and Development facilities to ensure Sigma's equipment delivers maximum performance, value and reliability with minimum overall life cycle cost to our customers. We refer to our data privacy policy at https://www.knorr-bremse.com/en/footer/data-protection/data-protection-declaration-knorr-bremse-ag/ Imprint: https://www.knorr-bremse.com/en/footer/imprint/