Aiming at precision problems that received signal strength indication（ RSSI） data is susceptible to environmental impact

localization time delay and big localization error exist in traditional train localization algorithm

effect of different deployment modes of trackside anchor sensor and communication radius of anchor sensor on train localization is studied. On this basis

a train localization algorithm based on new sensor anchor nodes is proposed. Using trackside anchor sensor RSSI value collected by gateway sensor

the weight and position coordinates of new anchor sensor nodes are obtained through optimizing. The new anchor sensor nodes are closer to actual location of the train

it can reduce localization error effectively. The simulation results indicate that compared with traditional weighted RSSI train localization algorithm

this algorithm improves localization effect of train and obviously enhances localization precision.