The technique of plastic scintillator bars coupled to wavelength shifting f
ibers is proposed for neutrino tracking calorimeters, in the context of ver
y large, massive detectors for experiments on the neutrino factory beam. A
prototype has been built with 180 scintillator bars interleaved with an equ
al number of iron bars. The light from the fibers is collected by multi-ano
de PMTs and converted with Amplitude-Time-Pattern self-triggering digitizin
g electronics. The prototype has been tested with electron and pion beams a
t CERN. (C) 2001 Elsevier Science B.V. All rights reserved.